The gas density in an emission nebula is typically about how many particles per cc?

A) dozen
B) hundred
C) thousand
D) hundred thousand
E) million


B

Physics & Space Science

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If a Cu2+ ion drops through a potential difference of 12. V, it will acquire a kinetic energy (in the absence of friction) of

A) 12. eV. B) 6.0 eV. C) 24. eV. D) 12. J. E) 6.0 J.

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What percentage of stars lie on the main sequence? Why?

What will be an ideal response?

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__________ is the prediction of special relativity that moving clocks run slow

Fill in the blank(s) with correct word

Physics & Space Science

Given that the speed of an electron in the ground state of hydrogen is 2190 km/s, what is the speed of an electron in the n = 4 orbit of hydrogen?

A) 547 km/s B) 31,000 km/s C) 139 km/s D) 178 km/s E) 2180 km/s

Physics & Space Science